Load compensating fluid pressure brake equipment



E. E. HEWITT Aug. 24, 1948.

LOAD COMPENSATING FLUID PRESSURE BRAKE EQUIPMENT Filed May 21, 1947 2 Sheets-Sheet 1 how 8 ANN 3 mi 3 M W w NM Q @Q 5 Q N @u Q3 v wo v g QQ @9 an P3 0Q WW.

2M .8 E P @Q g Om mg or mg 09 mm 0 Om @N 1948. E. E. HEWITT 2,447,857

LOAD COMPENSATING FLUID PRESSURE BRAKE EQUI PMENT Filed May 21, 1947 2 Sheets-Sheet 2 INVENTOR Ellis EHewz'it 6x14 4% ALJATT RNEY cars when empty as Welles when loadei. example, the brake cyhnderflevice isw-nroporequ pment ebcveamentione ha l s in response t emere nsmresiwtm p e pressur provid s ,en .s eh inshot, u

Patented Aug. 24, 1948 UNITED OFFICE 1 LOAD; GDMPENSATING FLUI-DTRESSURE BRAKE EQUIPMENT i-El s aLiHfQWifi i .Es se e-k -l: assi n r to v Th 1, Westin house Br k om anxWflm xdine Paw .cnrro et ono nns vani Application May- 21, 1947 Serial"N .-749,572

in accordance with :the weight-cf the 2351: -.which varies according-t0 the empty or loadedr,.condition thereof.

The vpresent trend-toward the; use 1of:al;ight

weight materials ill-113116 censtructlon gf, railway cars has resulted in muelmhighen .ratioseqf grass to tare weight thanever before encounteredhand the Well known, standard ff ABf brake equipment for freight cars employinggthe usual type, qfijoreke cylinder device, disclosed :in ,C; Gi -Farmer Bartent No. 2331 213,- issued; February 718,; 1936- will not provide the desired: degree. pf hrztlsirlgv -.0

ticned to prcvidethe: desired 1 degree ,oflm'eking of the car when -empty; it '.-ls ;W 101'1y ined-e t for braking the car-when iullyvloedem an versely; :if it is ,pronortiQned .to -.;edefl lh l the fully loaded car, it will provide excessiv s of h m ty: lee Whicmmishwesul a in ho ks i wa: .tr-ein, end:;;nndesire s A of the. car wheels,

-. In. order to prlone vbrekei h n wilishtwe sh fr igh serene load; cprnne se inefib ake;m

m nt, dis l se a th icep ndinei e el eetlene March. 20, 19e ,;.,ess ;ene wt the s eeee Q xth UnshB e khrek mended which is automatically perativeto-y ry;the-;;leree, of brak n o themes i isubste kp enrtion toai weight Wheth l mptu o he rth. x0

p n a p cation en y mbefiy brake ,contmilling valve dftjllCfiOf the .fij

.ful-ly loaded.

under pressure .to. thezbrak cylinder; devipe to eate a s e tise iel etereatiqn ofi theme n h t ain to :cwsetheirein {i 03 ste n-t gently ather towa d t e .irpnt end oi-t eftreinhis inshot-of; fl unde m es urea en 01- lowed. by a 'enadueh n 91 np y cfluid und ,..pressu ..;to.;the; ke 6 d su h a irelet ve mslommt s en fifir ilehi matieh as to vpermit the slack in the train ltoisufliciently gather to prevent harsh slacklaction fc-llowing which, the rate of vsumaly oi fiuid under-pressure to: the hrakeeylinder -device isincreasedto a relatively rapid rate -to quickly. obtain, the-required braking force to-promptly bring, the train .toua stop.

"The above mentioned load compensating brake equipment provides a higher degreeotbraking on a loaded car than cbtained with the AB equipment, due to which, there is a possibility that, in efiecti ng an emergency, application" of the brakes they umz flu df nd nm u e th ak c l nele d icei rev ded y th YalYe.. will ceuse a dev el opment sci braking force 11 en-reef. a trainsulficiently-faster than obta inedwwith the AB equipment as to accelerate the gether ing of, sleek to a degree which will resultin d ma in sh ck r a e e ne e o je ,of the,in ventiqr is -th'erefor'e the provision of a .Qe ,.eqmpenset ns. br eequ ent mqd in I means, separate from the fAB valve foi ming I a. pa ,o hee u pmen rinem' nstha ama ,i gshockswi no derel e n tr i u n ef e in .3 mer en y a p ic ti n of b .jlIheload ,cgmpensating brake equipment dis,- Qlosed, in the above mentioned. Cook. et, a1. applicetion comprises, in edqition to the ffAB velve, & sor lle cq mnen et e bra cyl d devi ,s e ting bralke cylinder device hastvvo pressure chambers, one in front of thecbrelie vcy-lind erpisten 1 corresponding to the usual .breke lcyl'inder ,pressnre chamber, and .to ,.which fluid under pre ures adapted ta/h s np i y the valve 1 m 2 reducti n l rb a e pipe pressure fo .eet etins, s i pist nmoe p h a cn th A t e l-ia posi e )si of th b akec ind pistg is a .qQmpenset ing, chamber in which; by o eration... he :lee -i qmp n a nev-dev t f fiuid ise adapted to be varied, from ss ef t ul de q zel bsse tial in .rse y n P e 1 m hed e e of e r load m eoertai tmex mu Press for th a whenemety Th s ure, he wwwsetieee e bempwe tha i v h lusu p i su whemh -t Jinnwh fe o the "lett ,nressure to. apply thehrelges, and as a conseyq enq t v ythe degreeief b akin the-w k substantial (proportion .to, the ca,rweight 1 as o e ne :.-t 1 ed er f 1. e 1-w r ewbm t aq mr he herl-t e iqa s m ty.

AQ QI' iE t t e m en ip reiis es wl t .withtheloe e qmne set s \d vm .de yvm e s r .eper t ye-iupenie tietipean-em reemv-ap l end. a. load compensating. device. The compention of brakes to render the load compensating device ineifective to control the pressure of fluid in the brake cylinder compensating chamber and to suply fluid to said chamber at a rate and to a pressure to limit the increase in braking force on the car to a sufliciently slower rate and limited degree than obtained in the variable load equipment disclosed in the above mentioned copending Cook et a1. application, as to positively insure a gentle gathering of the train slack. At the termination of a period of time required for the gathering of train slack the delay means automatically restores the control of pressure to the brake cylinder compensating chamber to the load compensating device which then operates to promptly adjust the pressure in the brake cylinder compensating chamber to the value cor responding to the weight of the car for promptly bringing the car to a stop.

Other objects and advantages will become apparent from the fOllOWiIlg more detailed description of the invention.

In the accompanying drawings; Fig. 1 is a diagrammatic View, mainly in section, of a load compensating brake equipment embodying one form of the invention; Fig. 2 is a sectional view taken on the line 2-2 in Fig. 1; and Figs. 3 and 4 are views similar to a'portion of Fig. l but embodying other forms of the invention.

Description-Fzg. 1

The load compensating brake equipment shown in Fig. 1 of the drawing may be the same as that disclosed in the aforementioned Cook et al. co- .pending application, except for parts embodying the invention which will be specifically pointed out hereinafter, and comprises a brake controlling valve device l to which is connected the usual brake pipe 2, auxiliaryreservoir 3, emergency reservoir t and brake cylinder pressure the above enumerated structures are adapted to be carried by a sprung part of as by the floor thereof.

The brake controlling valve device I may be of substantially the same construction and have the same operating characteristicsas the "AB valve fully described in the Farmer patent above mentioned, in view of which it is not deemed necessary to show and describe this device in detail. Briefly, however, the brake controlling valve device I comprises a service portion In adapted to operate upon both a service and an emergency reduction in pressure of fluid in the brake pipe 2 for supplying fluid under pressure from the auxiliaryreservoir 3 to a brake cylinder pipe H and thence to the brake cylinder device 6 for, upon a service reduction in brake pipe pressure, eifecting a service application of brakes on the car. The brake controlling valve device i also comprises an emergency portion 12' which is adapted to operate only upon an emergency reduction in pressure of fluid in brake pipe 2for supplying fluid under pressure from the emergency reservoir 4 topipe II and thence to brake cylinder'devlce 6, wherein such pressure, in addition to that provided from the auxiliary resa car, such 4 er'vcir 3 by operation of the servic portion [0, is adapted to operate the brak cylinder device 5 for effecting an emergency application of brakes on the car. The service and emergency portions H1 and 12 of the brake controlling valve device I are mounted on opposite faces of a pipe bracket E3 to which all pipe connections to said valve device are made, as shown in the drawing.

The brake cylinder device 6 comprises a hollow cup-shaped casing 14 to the open end of which is secured an annular pressure head l5 from which projects a hollow cup-shaped non-pressure head it. A brake cylinder piston I! is slidably mounted in the casing M and at one side thereof is the usual or a main pressure chamber is to which is connected the brake cylinder pipe I l.

The brake cylinder piston I! comprises a piston head Hi to one face of which is connected a flexible packing cup 20 for preventing leakage of fluid under pressure from pressure chamber 13 to the opposite side of the piston. Secured at one end to and projecting from the piston I1 in a direction away from the pressure chamber 98 is a hollow stem 2! the opposite end of which is slidably mounted in a ring 22 secured in the pressure head I5. Carried by the pressure head 15 and ring 22 is a packing cup or sealing ring 23 having sealing and sliding contact with the outer peripheral surface of the stem 2| for preventing leakage of fluid under pressure from a compensating pressure chamber 24 formed around said stem between the pressure head l5 and the piston I1, to a nonpressur chamber 25 formed within said stem and open to the interior of the non-pressure head [6 and thence to atmosphere through a port 26 in said non-pressure head. The pressure chamber 24 is open to a pipe 21 through which fluid under pressure is adapted to be supplied to and released from said chamber by operation of the compensating valve device 8, in a manner which will be hereinafter described.

The brake cylinder piston head I9 is provided with a hollow boss 28 projecting into the hollow stem 2| in coaxial relation to said head and stem, and one end of a hollow rod 29 is secured in said boss. The rod 29 extends through the nonpressure chamber 25 and a bore provided in the outer end of the non-pressure head l6 to the exterior thereof, said rod being hollow to accommodate the usual push rod (not shown) for connecting the piston head 11 to the brake rigging (not shown) of the car, in the conventional manner. Encircling the hollow rod 29 is a brake cylinder piston release spring 38 one end of which bears against the piston head IQ for moving the brake cylinder piston to its brake release position, in which it is shown in the drawing. The opposite end of the release spring 30 is supported on the non-pressure head It.

The load compensating device 8 comprise a casing containing pilot and balancing flexible diaphragms 3i and 32, respectively, preferably of the same area, arranged edge to edge in spaced apart relation with their aXes parallel and clamped around their edges in the casing. At one side of the pilot diaphragm 3| is a pressure chamber 33 which is connected to the brake cylinder pipe I l through a passage 34 and a pipe 35. At the same side of diaphragm 32 is a, balancingchamber 36 adapted to be normally connected to pipe 2'! leading to pressure chamber 24 in the brake cylinder device by Way of a restricted passage 3'! and a passage 38. Engaging the opposite face of diaphragm 3| is a follower 39-provided-on1one end=of a-stemAt-the-opposite end. ot whichengages arr-equalizing member or beam 4l-within a-pocket 42. eEngagin-g the opposite end -of-beam 4| Within a similar pocket 43-is-one end=of a stemM. The'opposite endof stemM- is in theformof a follower which is secured to the side-of V diaphragm '32 opposite chamber -36-by--meansof a nut 46 containedin saidchamberand between whichnut and diaphragm is interposed a spring seat A1.

The nut M has an extension Msslidably mounted-in a bore in thecasing ian-diseparating chambered-from a chamberlw which. is inicommunication with passage. 38. A "precompressed spring 50' contained in chamber 36 has-lone 'lend supported by :the casing while its opposite end bears against the spring seat. :41. The nut 45 and extension- 18 thereoi are-providedwith .an axial-bore 54! open atone end to a-v'chamberniiz inthe casing and provided .aroundthe opposite F end witha valve seat arranged for engagement by a releasevalve 53 which is contained in chamber 49 and: which has a flutedstem .54 slidably mounted in saidbore. Chamber-52 isin-constant communicatiomwith the atmosphere as through a passage ifi. alt-wilL be-..noted thatthe diaphra-gm stems; 4t, =v:44,-andbeam: M. are "corn taineddn'- chamber 5 2 and. that the lower faces of the two diaphragms .3 I and 32 areboth subject to atmospheriopressure in said chamber.

w The release valve 53, opposite the fluted stem 54y-has an enlarged annular collar 56- one a side ofi'whichis provided for -contact with .a combined -.va-lve guide and stopelement "51 proj ecting-fromL the casing into-chamber 49:, while the opposite side i is arranged =forcontact by the end of a: fluted-stem 58bia'coaxially arranged fluid pressure supply-valve -ti which iscontained in a-chamber-= 6fl. The-chamber 65 is-;open--toa passage 61--leading 'toa pipe S1 which -is connected-to the load reservoir 7. Abiasspring 63--c0ntainedin chamber ell-bears on the supplyvalve 59-for urging it toward its seat.

-The-side-ofthe-equalizing member orbeam opposite that from which the-diaphragm follower stems 40 and -44 project is-supported-on a fulcrum-preferably in the form "of aroller "64, which is carried by an axle 65' on an --enla-rged central portion 66 thereof -'(-F ig.' 22) The axle I 65 has reduced-'end-portions 61' at opposite-ends of theeentralportion 66 and mounted on these end portions are rollers 68, one'disposedat either side ot-beam and arranged to roll on a 'fiat surface 69- in the-casing. The surface 69 is 4 formed at right angles to the normal, substantially-parallel a-Xesof the di-aphragm's 31and32.

'The equalizing member or-beam 4l= is--held against longitudinal movement by a yokefl-flpivot'ed at-oneend on apin l I carried in an arm 72 projecting- -from the casing. The two arms '12 of the yoke T0 are disposed-at opposites o'fthe beam 4| between the rollers 68 andtheir ends are pivotally connected to said beam near its center by a pin 13. 'The roller-64 is'adapted to be adjusted relativeto thebeam 4| longitudinally thereof-to provide at its-line ofcontact' with the beam a fulcrum therefor, the-yoke: m being eifecti-ve idur ing such adjustment, and at all other times, to prevent longitudinalmovement of said beam but in no way interferingwvith.rocking movement of saidhbeameupon its tulcrum connection with therrolleraM, which wil-l be latendescribed.

T'lDiSBOSBd-bGtWEBH the equalizing member-or beam: :4] and :the surface- 6a .and extending lengthwise of and substantially, :parallel to saidsurfacedsa plstonwod The; sed n-has at substantially semi-ciroular recess =15 --:"ot a larger radius than roller 6 l-i or-- receiving-saidroller, and at either side 'of said recess-said-rod is. provided with a transverse slot 1 G tEig; 2-) v open to the-top-edge of said-rod and in-these slotsthe enlarged eentraL-portionifi of-axle 65 air-either side of the--roller--64, is s-lidably 'moun-ted,--the ro11- ers- -63--beingdisposed at oppositesideswi the piston rod I4.

Connectedtoone endof the piston -rod 1 tie a biaspi'ston 11' open at one side -toaeontrol or pressure chamber -18; While the-opposite sidetof said piston is open to the atmospherie chamber 52. A shoulcler l-9--in theeasing is arranged for contact by---'-piston' ll -for--limiting---movement therof in the direction of' the 5 left-hand ;--movementin I the directionot the right-hand being limited by contactwith the --ca sing. The piston rod 14 projects -from the piston "1 Land through the ch-amber '52-and a bore'in a-wa1l'*80-sepa-rating-said chamber from a chamber 81 in the casing; the end -of-said rod-opposite said-piston being supportedby I contact with the-Wall of-said bore.

"The fulcrum roller-54 has two extreme, positions with respect to the equalizing member or beam -41,- one position being that in which itis shown-in the-drawingin which the roller 64 is disposed substantially below the end 'of thediaphragm follower stem--40 andthe piston 11 is slightly spaced fromtherig-ht hand-end wall82 of chamber li-l. "This position will be assumed when the car is -fully-loa-d-ed and will hereinafter be referredrto as-the full load position. The other-extreme; position, to be hereinafter referred to as empty position, and which roller 64 will occupy when the car is empty,is adapted-to bedefined, by contact between piston 11) and shoulder'19. For various degrees 'ofcar load between empty andfull load the roller '64 will assume a corresponding position between the empty and full load positions, just mention'ed. Automatic adjustment-off fulcrum rqller 5 to; its different positions will hereinafter be describedl -The piston-rod 74 is provided in chamber with a 'pluralityo-f teeth'83 alongthe side opposite-the beam 4] for engagement by teethon one end of a -latch of locking "plunger -84 which is mounted to=slide inthe casing in a direction at right angles to'thelength of said rod. A lever 85 fulcrumed-on a pin 86 carried by a projection of the casing has-oneend connected to the plunger 84."--';Ihe-opposite end of lever 85 is con nected-to-one'end of a -rod"81'by a p in 88-, the opposite end of which rod isin the form of a follower-"89 which engagesone side of alatch-or plunger control flexible diaphragm 0 clamped around-its periphery-in the casing. A spring fil' encircling therod 8! and supported at one end on thecasing bears against the; diaphragm- 90 for urging it and plunger-84 to' th'e position-in which theyareshown-in the drawing, in which position said plunger is in looking engagement with the piston rod 14. "At the oppositas ide'of diaphragm '91 is apressure chamber illto which fluid underpressure is adapted to be supplied for deflecting said diaphragm against spring SI for thereby actuating-163 8185 togdraw plunger 84 out "of lockingengagement with piston 1501:1714.

Aicheckva1ve-93 -contai-ned-in achamber 94 is provided -for closing communication; between said 1 chamber and a chamber- *95- into which extends aprojection "9 B--=of-- -the plunger; 84. With plunger- 84- in locking engagement with 'pist0n' I4, the end of projection 90 is spaced from check valve 93 a distance slightly exceeding the extent of movement of said plunger required to release said plunger from said rod. Upon further movement, the projection 90 is adapted to engage and unseat valve 93. A spring 91 contained in chamber 04 acts on check valve 03 for urging it to its seat. A ring seal 98 on plunger 84 prevents leakage of fluid under pressure from chamber 95 to chamber 52.

Spaced from and extending generally parallel to the bias piston I1 and its rod 14 is an adjusting piston 99 and a rod I projecting from one side of said piston through a non-pressure chamber IOI which is open to chamber 52. At the opposite side of piston 90 is a pressure chamber I02 open to the bias piston chamber '10 and to a passage I03 which passage also connects to chamber 95. A spring I04 contained in the nonpressure chamber IOI and encircling the rod I00 is supported at one end on the casing, while its opposite end bears against piston 99 for urging said piston and rod to the position in which they are shown in the drawing. The end of rod I00 opposite the piston 99 is supported in a bore in the wall I separating chamber 52 from a chamber I06.

A lever I01 extending through an opening I08 in a horizontal portion of the casing wall 80 is fulcrumed therein on a pin I09. The end of this lever in chamber BI is arranged for contact with the end of the bias piston rod I4, while the opposite end of said lever is disposed in a slot III] provided in the adjusting piston rod I00. The slot III) is of such length as to permit the lever I01 to be free on pin I09 with the adjusting piston 99 in the normal position in which it is shown in the drawing, and to permit a chosen extent of movement of said piston against spring I04 before an end wall III of said slot engages said lever.

In chamber I00 the end of the adjusting piston rod I00 engages a roller II2 provided in the end of an arm I I3 of a bell-crank like lever II4 which, at its knee, is fulcrumed on a pin II5 secured in the casing. The lever II4 has another arm II6 on the end of which is provided a fixed cam sur-- face I I! arranged for contact by a roller I I8 provided in one end of a lever Hi! the opposite end of which is secured to turn with a shaft I20 journaled in the casing. The cam surface H1 is of least radius at the end adjacent the roller I I8, as viewed in the drawing. Secured by a pin I2I to the bell-crank arm IIB, adjacent the opposite end of cam surface I I7, is an adjustable cam element I22 having a cam surface I23 constituting an extension of the fixed cam surface I". The cam element I22 is supported on one end of an adjusting screw I24 carried by the lever arm II3. A lock nut I25 on screw I24 is provided for contact with the lever arm II3 for securing said screw inan adjusted position.

A lever I26 disposed outside of the casing (in practice) has one end secured to turn with the shaft I20, and connected to the opposite end by a pin I2! is one end of a connecting rod I28. The other end of rod I28 is connected by a pin I29 to the end of one arm of a bell crank I30 the end of the other arm of which is connected by a pin I3I to a rod I32. The bell crank I30 is pivoted at its knee on a pin I33 carried by a sprung part I34 of the car, and the rod I32 depends from the bell crank through an opening in said sprung part. To the lower end of rod I32 is secured a substantially c shaped measuring element I35 within which is disposed an unsprung part I30 01 a car truck. The part Ibo may be in the form of a rod extending transversely of the car truck or 11 desired may constitute an axle or a truck wheel and axle assembly. A compressed coil spring is] encircling the rod I52 and having one end supported by the spring truck part Ddwl'S against a Ionower I56 011 said rod 101' urging the element E50 to the position in which it is shown in the drawing, out of contact with the unsprung truck part I55.

The load compensating device 8 further comprises a cut-out valve device I39. The cut-out valve device I39 comprises two coaxialiy arranged, nexible diaphragms I49 and MI cramped around their edges in the casing and spaced apart in their relation to each other. Between the two diaphragms is a chamber I42 which is open to atmosphere through a vent port I43 and which contains a spring I44 the opposite ends 01' which bear against followers I45 and I40 engaging diaphragms I40 and MI, respectively, for urging said diaphragms apart. At the outer face of diaphragm I4I, which is larger than diaphragm I40, is a pressure chamber I41 which is connected to a passage I48 also connected to the latch diaphragm chamber 92. At the opposite face of diaphragm I40 is a valve chamber I49 which is in constant communication with brake pipe 2 through a passage I50, a choke I'5I, a passage I52 and thence by way of a pipe I53 in which there is provided a choke I54. In actual practice the pipe I53 is connected directly to pipe bracket I3 of the AB valve I and through said pipe bracket to the Well-known brake pipe connection (not shown) therein, and the choke I54 is disposed in said bracket, but for the purpose of simplicity in the present application, the pipe I54 is shown in the drawing connected directly to the brake pipe 2, as above described. The cut-out valve device I39 further comprises a slide valve I55 contained in chamber I49 between two spaced shoulders I56 formed on a stem I51. One end of the stem I-5'I is connected by follower I45 and a cap screw I58 to the center of diaphragm I40 for rendering the slide valve I55 movable by and with said diaphragm.

Connected to the seat of the cut-out slide valve I55 is an atmospheric passage I59, the passage I03 from the bias and adjusting piston chambers 18 and I02, a passage I50 which leads to the check valve chamber 94 and to a timing reservoir I5I, and passage I48 leading to the latch diaphragm chamber 92 and to diaphragm chamber I41. The slide valve I55 is provided with ports I62, I63, I04, and I65 and a choke connection I00, for a purpose to be hereinafter described. i

The load compensating device 8 further comprises two check valves I01 and I08 arranged in series in a communication between the brake pipe passage I52 and a passage I09. A bias spring I10 acts on the check valve I08 for urging it to its seat. The passage I59 is connected through a choke III to a passage I'I2 leading to the supply valve chamber 60 and thence through passage 5| and pipe 52 to the load reservoir I.

According to the invention I associated with the load compensating device 8, a delay valve device I13 and a timing valve device H4,

The delay valve device I13 comprises two spaced apart coaxially arranged flexible diaphragms I15 and H6 which are clamped around their edges in the casing. The two diaphragms are separated by a partition wall I TI and are operatively connected toreach. other-:byriollowers' I, and. I19" engaging; respectively, the adjacent; faces ofssaid diaphragms .andprovid'ed witlrtele-iscoping stems I89 and 'I8I slidablyzmounted in coaxiallyi arranged bores through said partition wall. A sealing .ring ,I 82in the partition, wall I11 is provided :ior. contact. with stem; .1801 for 1 preventing leakage: of fluid :underpressure; along thestemsl'flflzand I8 I'lfrom a chamber; I83 .for-med atone sideoi diaphragmvl15 to a chambernIM-Q formed. at: the" adj acentwside 1 of diaphragm:-- I1-4. I

The chamber I34 is open'to atmospherethrough a side-of= diaphragm I15 is a pressurechamber I862:

connected to'a passage 2I4 leading to the-timing valve device I14, while at the opposite's'ide of diaphragm I151is a chamber I81 which is connected to passage I52' and thereby'to thelbr'ake pipe-2..

A poppet valve IE8. containedin chamber; I 83 at: one side of the follower I19-has a fluted-stem I 89 arranged to slide in a bore extending through partition wall I'llto chamber ,I85-at one'sidelof and paralleltot the diaphram follower stems I80,

I81; forncontrolling communication between pas-- sagez38; ,vvhich'is open to said bore, and said chamber; A spring Ifill-tdisposed in chamber I83 and; supported at: one end on the diaphragm fo1' lower I19bears'against the valve I88'for seating:

it The valve; stem I89 engages in thevbore in partition wall. I11 one-end of a plun er I9I slidablymounted in said bore and extending through. chamber IBi-or engagement bythe diaphragm follower I185 Deflection of diaphragm; l'lfi 'in. the-direction of valve I88 is adapted to operate plungerIQ Ii'tounseat'said'valve. At the opposite side of. ,diaphragm follower stem I80 isaanother poppet valve I92.- contained .in a chamber, 493' connected to passage 6| and having a flutedstem- I94 extending parallel to'said diaphragm-follower stem through a suitable bore in the partition wall I11 into chamber I83 for contact by-the diae phragm follower I19 for unseating said valve. A

spring Wain chamber I93 acts-onthe valve I92- forurging it to its closed position with the dia--.

phragm I15 in the position in which'it is-"shown inthe drawing.

A spring 4% contained in chamber I81 and having one end supported by the casing bears at its opposite end against a spring follower 19.1

provided for engagement with the adjacent face of'diaphragm E15. Projecting from the spring follower I31 isan operating stem I38 arranged for-contact with a fluted stem I99 of a check valv'ezdil for unseating said checkvalve upon= movementof'diaphragms I15'and I16 in the direction of said valve and for permitting closure of said check valve when in the position inwhich they are shown in the drawing. The check valve zdlliiscontained in a chamber 2M whi'chisconne'cted through a chokelflz and a passage203to the timing valve device I14, A light valve-spring 2%. contained in chamber 20! acts on the check valve-2flll "for urging it to its closed position-l Thejtimin'g: valve device I14. comprises a flexible diaphragm 265. at one side ofM/hich is a chamber :Ztili to .which'is connected the passage 203;the passage-2E3 also leading to atixnin'g volume 23-1 in the load compensating valve device ilgthis volumexconstituting a part of :the present invention although it was also disclosedlin the above referred to copending Cook et a1, application wherein! it performed 1 no useful functions At the opposite side: of diaphragm JZUS-isa chain- 10 berrZIlB :Which is opento atmosphere, through a vent port 209. An operating stem 'ZIO: disposed; in-achamber IIIB-hasone end inconta-ct with the adjacent; :face: of diaphragm:.;205: while acting against the opposite end; of I said? stem, in a pre.-;

compressed; spring 2| I-. Asli-dewalve 212: mount:=-

ed to slideion. a seat in chamber. -2Il8 iszdisposed-zin a recess in stem 2H]; for movement-thereby. The-- slide-lvalve;2:l 2 has a cavity 2I-3' for,.in one posh-,-

tion of; said valva connectingp ss e 34; ton-1a passage2Ml leading; t ?diaph agmmhamberolflfitinz thezdelay; valve: deviceiuI13; In' another; position: the-slide-valve 2 I12 closeseommunicatiorrbetwefinz passe-geese and, 2M, and the lattermpassa e is opened to-1chamber-;2Il8 and thenceto atmosphere:

A. *spring :2I5 contained in chamer 10B; acts:

through a pusher pin 2 I6 ionz-rt-heslide valveHZi for holding it seated, against pressure-mifluid effectiven: c v y' 3 w Opemtion-Fig. 1 .l

In oper-ationtlet it be initi-ally assumed that the brake equipment is devoid of fluid under pressureand that to conditionsaid equipment for -opera-= tion fluid under-pressure is supplied to the-brake pipe 2 in theusual manner;

The-brakecontrolling valve device I will re-- spond, in the usuaLmanner, to "the pressure of fluid thus supplied tothe brake piped to charge th auxiliary reservoir 3 and the emergency-res ervoir- 4 with fluid under pressure from *thebrake pipe, and to at the same time-opento atmosphere,- it" not alreadyopened; the brake cylinder -pipe- I1 and therebypressurechamber I8 in-the brake cylinder device 6. With pipe II thus open -to at mosphere the pilot diaphragm chamber M in-the load compensating device 8 will-alsobe open toatmOsphere-byWay of passage- 34 and pipes -35 and I I=, whichwill' permit spring to deflect the balancing diaphragm 32 against the stem 44 and rock -the balancing beam 4| about 'itsfulcrum connectionwit-h roller 64; regardless of the ad-* justed position- 0f said roller,- to deflect the pilot diaphragm 3| into contact-with the casing, in which position these parts are shown-in the draw With the balancing diaphragm 32;positioned' as just described sprin 63 will seat the" fluid pres-:-

sure supply valve 59 and the collar SB-entire" re the supply valve stem .58'and in engagement with thestop element 51 which will hold said valve out of contact with itsseat on the nut'extension '48; With the release valve 53thus open; chamber 49 and passage 33; and thereby chamber 35,Wl11'b open to atmosphere byway of boreq5l inthe nut dii chamber 52 and atmospheric port"55-.-

With the parts of the timing-valvedevice 114 in the position in which they are shownin the drawing, diaphragm--chamber I in thedelay valve device -I13-will -beopento atmosphere through-passage 2| 4 and "chamber 208 in said timing valve device, so that spring. I96 in the delay valve device will deflect the diaphragms I16 and I15tolthe position-in which'they -areshown on the drawing to permit closure of valve' I92- by spring ISE- -and openingot valve I BB by plung er I912 With valve 189 open, diaphragm 'cham' ber-I83 and thereby-the connected brakezcylindercompensating chamber 1-24 will be open to-pas=- sage -38 and thus to atmosphererpast the unseated release valve 53*; 1 With pressure chambers I8 and M inthe brake-cylinder device 6 both open to atmosphere-the brake-cylinder piston .I1:wil1 as sume its brake. release position, inF WhiCh :it is 11 shown in the drawing, under the action of the release spring 30.

When fluid under pressure is supplied to the brake pipe 2 for charging the equipment as above mentioned, fluid will also flow from the brake pipe through choke I54 and pipe I53 to the load compensating device 8 and thence through passage I52, past the check valves I61 and I68 through choke I1I, passage I'I2, supply valve chamber 60, passage 6| and pipe 62 to the load reservoir 1 for charging said reservoir with fluid at substantially the pressure in the brake pipe. Fluid thus supplied to passage 6| will also flow to the poppet valve chamber I93 in the delay valve device I13, but the poppet valve I92 in said chamber will at this time be closed under the action of spring I95.

Fluid under pressure supplied from the brake pipe to passage I52 in the load compensating device 8 will also flow therefrom into chamber I81 of the delay valve device I'I3and therein act to unseat the check valve 200 against the relatively light force of spring 204 whereupon fluid from the brake pipe will flow past said check valve to chamber 20I and thence through choke 202 and passage 203 to diaphragm chamber 206 in the timing valve device I14 and also to the timing volume 201 for charging said chamber and volume with fluid at substantially the pressure in the brake pipe.

At the same time, fluid supplied from the brake pipe to the load compensating device 8 will also flow from passage I52 through the choke II and passage I50 into valve chamber I49 of the cut-out valve device I39.

The parts of the cut-out valve device I39 have a cut-in position which they occupy when the equipment is devoid of fluid under pressure and during initial charging of the equipment until the brake pipe pressure is increased to a certain chosen pressure, such as 40 pounds, whereupon said parts move to a cut-out position in which they are shown in the drawing. The parts then remain in the cut-out position until the brake pipe pressure is subsequently reduced, as upon an emergency reduction in brake pipe pressure, to a degree such as 8 pounds, at which time they return to their cut-in position, all of which will be hereinafter described.

In the cut-in position of the cut-out valve device I39 the spring I 44 deflects the diaphragm I II into contact with the right hand end wall of chamber I41 and deflects the diaphragm I40 and moves slide valve I55 to a position in which ports I 64 and I65 in said valve register with passages I48 and I60, respectively, so that fluid under pressure supplied to chamber I49 from the brake pipe will flow therefrom through port I64 to passage I49 and thence to check valve chamber 94 and timing chamber I6I and, at the same time, fluid will also flow from said valve chamber through port I65 to passage I48 and thence to the latch diaphragm chamber 92 and also to diaphragm chamber I41.

When the pressure of fluid thus supplied to the latch diaphragm chamber 92 is increased to a degree, such as pound, which is sufiicient to overcome the opposing force of spring 9|, the diaphragm 90 will deflect against said spring and actuate lever 85 to draw the locking plunger 80 out of locking engagement with the bias piston rod 14, following which, the projection 96 of said plunger will engage and unseat check valve 93. Fluid under pressure supplied from the cut-out valve chamber I49 to the check valve chamber 94 will then flow to chamber 95 and thence through passage I03 to the adjusting piston chamber I02 and to the bias piston chamber I6. Fluid under pressure thus provided on the bias piston 11 will promptly move said piston in the direction of the left hand for thereby actuating the axle 65 to move the fulcrum roller 64 to its empty position substantially under the pin 73.

When the pressure of fluid in chamber !02 acting on the adjusting piston 99 is increased to a degree suflicient to overcome the opposing force of spring I04 said piston will move against said spring and thereby rock the bell-crank lever H4 in a clockwise direction about pin H5, and through the medium of cam surface I I1 the levers H9 and I26 will be rocked in a counterclockwise direction and pull the connecting rod I32 in an upwardly direction. This movement of the connecting rod I32 will in turn draw the measuring element I35 into contact with the unsprung part I36 of the car truck, which will prevent further movement of piston 93 by pressure of fluid in chamber I02.

When the equipment is devoid of fluid under pressure, as well as after an adjusting operation such as being described, the measuring element I35 will occupy the position with respect to the unsprung part I36 of the car truck in which it is shown in the drawing when the car is empt so that during adjustment movement of the piston 99 will be stopped by contact between said element and the unsprung part I36 when the surface II I on the adjusting piston rod I00 just contacts the adjacent end of lever I01 with the other end of said lever just in contact with the adjacent end of the bias piston rod 14 and with the bias piston 17 and fulcrum roller 64 in empty position above described. Thus for an empty car the fulcrum roller 64 will be adjusted to its empty position in which it is shown on the drawing. Furthermore, with the car empty the roller II8 carried in the end of lever II9 will move just to the junction of the fixed cam surface II! on the bell-crank lever H4 and the adjustable cam surface I 23 on the adjustable element I22 when the measuring element I35 contacts the unsprung truck part I36.

If the car is fully loaded the body thereof will occupy a position closer to the unsprung part I36 of the truck than when the car is empty. In this fully loaded position the lower portion of the measuring element I35 may therefore initially occupy a position such as indicated by a dot and dash line 2" in the drawing and therefore require a greater movement before it comes into contact with the unsprung part I36, to thus permit a greater movement of the adjusting piston 99 by pressure of fluid in chamber I02 than when the car is empty. The adjustable cam I22 will therefore become effective to operate levers H9 and I26 during this greater movement and said cam will be so adjusted by regulating screw I24 as to permit sufficient movement of piston 99 to actuate lever I01 to move the bias piston rod I4 and piston 11 against pressure of fluid in chamber 18 to a position in which piston 11 is in substantial contact with the right hand end wall of chamber I8 and in which the roller 64 will therefore occupy its full-load position substantially under the end of the diaphragm follower stem 40.

For various degrees of load on the car between empty and full load, the car body will assume corresponding positions with respect to the unsprung part I36 of the car, and as a result, the measuring element I35 and the fulcrum roller 64', as

actuated by--the' a'djustiirig*'-pi ston-' 99; Will-"like wise assume corresponding posi-ticns between the empty and full load 'posi tions thereof,' as will be" and full loaded conditions -thereof in order to" obtain the desired positioning "of roller 64 for the empty"andfullldad'edconditions of the car;

regardless of variations in the deflection characteristics of said springs such as encountered on application herei-ntofore referred to."

While the fulcrum roller 154 of the load compensating devices isbeing adjusted to aposi-tion corresponding "to the empty or loaded condition.

of the car as just described; the pressure of'fiuid in'diaphragm chamber I41- of th'ecut-out valve device I38 will i continue to increase with the in crease in'pressure =in the'cut-out valve chamber I49 :and in=the=brake pipe'Zx This increase in pressure'in-diaphrag-m chamber Ml will act to gradually deflect diaphragm IM- toward the'left hand to correspondingly increase the pressure "of spring I'M against diaphragm we so as to oiiset the increase of pressure of fluid inchamber I49 on'diaphragm- I40 and-thus hold the latter diet phragm and slide valve 1 I 55 against movement out of the cut-in position. Eventually, however. the pressure elf-fluid Y in diaphragm chamber I 4?! will become-=increased to adegree at which'deflection of diaphragm 4 i 43 will be stopped by contact of the'diaphrag-m follower 45 with the easing -as shown in the drawing; therebylimiting to'a certainselecteddegree the increase in pressure of spring-l44-against diaphragm MIL Then when the pressure of fluid in the brake pipe 2 and in valve-chamber I4-9-1becomes increased to a certain higher degree; such as-40- pounds; which is sufficient to overcome the opposingcincreased pressure of spring M4; the diaphragm-I40 will bedeflected'towardthe right handto a position defined by contactbetween-the diaphragm follower I45 and the casing; as shown inthe-drawing, forthereby shifting the slide valve idli' toits cut-outpo'sition.

In the f cut-out position of the cut-out slide valve ISE -theport I62 therein connects-passage M8 tothe atmospheric passage -I59 whereupon fluid underpressure is vented from the latch diaphragm chamber 92 and from diaphragm chamber Mi l. The venting of fluid-under-pressure from-the latter chamber permits the diaphragm I4 I- to be returned to the position defined by contact-with the right hand end wall of chamber I41 by spring- I42; which reduces *theforce of said spring onthe diaphragm-14D to a degree which will prevent return-of the latter diaphragm and of the slide valve I 55 to their cut-in position un til the brake pipe pressure effective in valve chamber I49 is subsequently reduced to a relatively low degree suchas-il pounds, therebyinsuring that the cut-out slide valve I55 will re main in its cut-out -position, so as to maintain the -fulcrumroller 64' in its adjusted position, during all normal operation of l the brakes onthe car while connected ina train;

The venting of -fluid under pressure vfrom the latch diaphragm chamber 92' upon movement of the cut-out valve I55 to its cut-out position permits spring ill to return diaphragm ea and lever 85 to the position in'which theyare shown on the drawing. This operation of lever 85 actu ates plunger '84 out-"of" en-gagement with the check valve 93 and "into "locking-engagefiient of the *bias pi'ston rod 14. The check valve 93 will then-be-seatedby spring 91.

At the same time as fluid under pressure is released from the latch diaphragm chamber 92 and from'diaphragm chamber I47, passage I 63 in slide valve =l55*connects passages I60 and I03 tothe-atmospher'ic passage I59 by way of the choke'connection I86. The timing reservoir I6I, previously charged with fluid under pressure fromfth'e brake pipe, is thus placed in communication withthe adjusting piston chamber I02 and bias piston chamber l8,'and said reservoir and these chambers are all opened to atmosphere through the'restricted connection I 66, whereby the pressure of fluid "in said reservoir and charm bers will be' gradually reduced at a rate determined by'the flow capacityof said connection. v

The volume of the timing reservoir I6I with respectto the flow'capacity of the choke connec ti'on 166' is such as to maintain suificientpressure in-chaniber "E8" on the bias piston TI and in chamber lfli-on the adjusting piston 99 to firmly hold the 'bias-pistonrod I4 against lever l0? and the measuring element I 35 in contact with the un sprung part I36 of the truck until after the lock ingplunger' 84 is 'moved into locking engagement with the bias piston rod l3,"following which, the pressure of fluid in said reservoir and chambers w ll continuet'o'reduce to atmospheric pressure;

When the pressure of fluid inthe adjusting piston biasspring 'I3'I acting-on therod I32 will urge said rod downwardly for moving the measuring element I35 out of' contact with theunsprung part I36 of the truck back to the position in which it'is' showncn the drawing, and during such movement the bell crank I39, connecting rod I28 and'thereby-levers I26 and I I9 will also be actuatedbysaid spring'to return the bell-' cranklever IIA tothe position in which it also is shown on the'drawi'ng; With the'me'asuring element I35 moved downwardly and out of contact withthe unsprung part I35 of the truck, contact thereb'etween will be avoided during operation of the car ina train around curves, over humps, etc.,' to prevent damage to these parts.

After the cut-out valve device I39 operates to cause locking of the fulcrum roller 64 in its adjusted position and disengagement of the measuring element from the unsprung truck part I36, as just described, the pressure of fluid in brake pipe 2 willcontinue to be increased upto the normal pressure desired to be carried, and the load reservoir '1 will become charged by way of the check valves I61 and IE8 to substantially the same degree of pressure-as will be apparent. Likewise, diaphragm chamber 266 in the timing valve device I'M and the timing volume 261 will to a position in which cavity 2I3 establishes communication between passages 34 and 2M.

With the equipment fully charged with fluid under pressure and the fulcrum roller 64 adjusted to its full-load position as above described, if it is desired to eflect an emergency application of brakes on the car the pressure of fluid in the brake pipe 2 will be suddenly vented to atmosphere in the usual manner. Since chamber I81 in the delay valve device I13 is open to the brake pipe 2 through the passage I52 and pipe I53, the pressure in said chamber will also promptly re duce to that of atmosphere by way of the brake pipe.

The service and emergency portions IE3 and I2, respectively, of the brake controlling valve device I will respond to the emergency reduction in brake pipe pressure to connect the auxiliary and emergency reservoirs 3 and 4, respectively, to the brake cylinder pipe I I and thence to the usual pressure chamber I8 in the brake cylinder device 6,-whereupon, by operation of the brake controlling device I, there will be the initial rapid increase in pressure in said chamber to a relatively low degree, such as 15 pounds, followed by the slow increase in pressure therein up to a preselected degree, such as 47 pounds, and then the rate of supply of fluid under pressure to said chamber will be increased to provide equalization therein of the pressure of fluid in said reservoirs, in the well-known manner.

Fluid under pressure thus supplied to the brake cylinder pipe I I and thence to the usual pressure chamber I8 in the brake cylinder device 6 will also flow from said pipe and through pipe and passage 34 to the pilot diaphragm chamber 33 in the load compensating device and also from said passage through cavity 2I3 in the timing valve device I14 to passage 2M and thence to diaphragm chamber I86 in the delay valve device I13. With the fulcrum roller 64 in its full load position, substantially directly beneath the end of the pilot diaphragm push rod 40, the pressure of fluid thus obtained in the pilot diaphragm chamber 33 will be ineffective to deflect the diaphragm 3| against the pressure of bias spring on the balancing diaphragm 32, as a result of which, said diaphragms will remain in the position in which they are shown in the drawing, in which the release valve 53 is open and the supply valve 59 is closed.

In the delay valve device I13, chamber I81 is, at this time, at atmospheric pressure due to being open to the brake pipe as above described. When the pressure of fluid from the brake cylinder pipe II obtained in the diaphragm chamber I85 of the delay valve device I13 becomes increased to a chosen degree, such as 25 pounds, suihcient to overcome the opposing force of spring I96, it will deflect the diaphragms I15 and I16 in an upward direction and, through the medium of spring I99, close the valve I89 and open the valve I93. Upon the opening of valve I89, fluid under pressure will then flow from the load reservoir 1 through pipe 62 and passage 6| to diaphragm chamber I83 in the delay valve device HI and thence through pipe 21 to the brake cylinder compensating chamber 24, wherein it will act on the brake cylinder piston I1 in opposition to pressure of fluid in chamber I8, to thereby limit the effectiveness of the pressure of fluid in the latter chamber to apply the brakes.

It will be noted that fluid under pressure is supplied to the brake cylinder compensating chamber 24 as soon as substantially 25 pounds pressure is obtained in pressure chamber I8, and due to these pressures opposing each other on opposite sides of diaphragm I15 in the delay value device I13, and the action of spring I96 on said diaphragm, the pressure of fluid in the compensating chamber 24 will increase in unison with that in the main pressure chamber I8, maintaining however a chosen differential (25 pounds) between such pressures which diiferential is equal to the force of spring I96 in the delay valve device I13. It is desired to point out, however, that as the pressure of fluid in the two brake cylinder chambers I3 and 2t increase in unison the effectiveness of the pressure of fluid in chamber I8 to apply the brakes on the car increases in proportion, but the brake application is limited to a degree which will positively prevent harsh gathering of slack in a train.

When the diaphragm I15 in the delay valve device I13 is operated to open the valve I92 the stem I98 is also operated to open the check valve 280 whereupon the pressure of fluid in diaphragm chamber 286 of the timing valve device I1 3 and in the connected timing chamber 2611 is permitted to flow past said check valve to chamber I 81 and thence to atmosphere by way of the vented brake pipe 2 at a rate determined by the flow capacity of the choke 202 in passage 203. The size of this choke with respect to the volume of the timing chamber 201 is such as to maintain suflicient pressure in diaphragm chamber 206 of the timing valve device I14 for holding the diaphragm 295 against spring 2 in the position in which these parts are shown in the drawing, for a period of time, such as 18 seconds, sufficient to insure a complete gathering of the slack in the train. At the termination of this period of time the pressure of fluid in diaphragm chamber 296 will be sufficiently reduced for spring 2H to deflect diaphragm 205 in the direction of the right hand to a position in contact with the casing, this movement shifting the slide valve M2 to a corresponding position for closing communication between passages 34 and 2M and for opening the latter passage to atmosphere by Way of spring chamber 298.

When passage 2M is opened to atmosphere through the timing valve device I14 as just mentioned fluid under pressure is promptly vented from diaphragm chamber H36 in the delay valve device I13 whereupon the pressure of fluid in the brake cylinder compensating chamber 24, efiective in diaphragm chamber I33, returns the parts of the delay valve device I13 to the position in which they are shown on the drawing. When this occurs the check valve I92 is closed by spring I95 to prevent further flow of fluid under pressure from the load reservoir 1 to the brake cylinder compensating chamber 24, and the check valve 183 is opened by plunger I91 to connect said chamber to the release valve chamber 49. With the fulcrum roller 64 in its full-load position the release valve 53 is open as above mentioned, so that when the brake cylinder compensating chamber 24 is connected to chamber 49 fluid under pressure will be released from said compensating chamber past said release valve to atmosphere, whereupon the pressure of fluid in the main pressure chamber I8 of the brake cylinder device becomes fully effective to apply the brake to the degree required for properly braking the fully loaded car.

The delay valve device I13 will operate, as above described, to supply fluid to the brake cylinder compensating chamber 24 to limit the i9 ated with the load compensating device 8 in place of the delay valve device I13 and timing valve device I14, shown in Fig. 1 of the drawing.

The control valve device 2I8 comprises a casi'ng containing two spaced apart and coaxially aligned flexible diaphragms 2I9 and 226 which are clamped around their edges in the casing. At the outer face of diaphragm H3 is a chamber 22I open to a timing chamber 222, while at the outer face of diaphragm 226 is a chamber 223 open to a timing chamber 224. Between the two diaphragms is a chamber 225 which may be open to atmosphere by way of a port 226. Extending through the chamber 225 is a stem 221 having at each of its opposite ends a follower 228, the two followers engaging the adjacent faces of the two diaphragms 2I9 and 226. A bias spring 229 in chamber 223 acts on the diaphragm 226 for urging said diaphragm, stem 221 and diaphragm 2I6 to the position in which they are shown in the drawing defined by contact between the latter diaphragm and a wall of the casing. The two diaphragms 2| 9 and 226 and stem 221 are movable in the opposite direction against spring 229 to another position defined by contact between diaphragm 220 and another wall of the casing.

A slide valve 230 contained in chamber 225 is disposed in a recess in stem 221 for movement therewith. Connected to the seat of slide valve 230 is a passage 23I from the timing chamber 222, a passage 232, an atmospheric passage containing a choke 233, a passage 234 connected to the release valve chamber 49 of the load compensating device, a passage 235 connected to pipe 21 leading to the compensating pressure chamber 24 in the brake cylinder device 6, and a passage 236 leading to a valve chamber 231, through a choke 238. The slide valve 230 has two cavities 239 and 240 for establishing different communications between various pairs of the passages just described, as will be set forth in detail hereinafter.

The passages 234 and 235 are connected by a communication containing a check valve 24! so arranged as to permit flow of fluid in the direction from passage 234 to passage 235 but to prevent flow in the opposite direction. The passage 232 leads to a valve chamber 242 containing a valve 243 arranged to control communication between said chamber and a passage 244 leading to the auxiliary reservoir 3. The valve 243 is provided on one end of a stem 245 which is slidably mounted in a suitable bore through a partition in the casing separating chamber 242 from a chamber 246 which latter chamber is open to atmosphere through a port 241. The chamber 246 is provided at one side of a flexible diaphragm 248 which is clamped around its edge in the casing and which is engaged within chamber 246 ,by an enlarged end of stem 245. At the opposite side of diaphragm 248 is a pressure chamher 249 which is connected by a passage 256 to passage 34 of the load compensating device, the latter passage being connected by pipe 35 to the brake cylinder pipe I I and thus to the usual pressure chamber I8 in the brake cylinder device 6. A spring 25I in chamber 246 bears against the enlarged end of stem 245 for urging said stem in a direction to open valve 243.

The valve chamber 231 contains a poppet valve 252 arranged to control communication between said chamber and a chamber 253 which is conmated by a passage 254 to passage 6| in turn connected to pipe 62 leading to the load reservoir 1. A spring 255 contained in valve chamber 231 acts on the valve 252 with a chosen degree of force urging said valve to a closed position.

In this embodiment of the invention the bias piston 11 of the load compensating device 3 is provided with a rod 256 differing from the rod 14 shown in Fig. 1 only in being longer andv being provided in one side with a notch 251.; The rod 256 cooperates with other parts of the load compensating device 8 in the same manner as inthe embodiment shown in Fig. 1. Depending from the poppet valve 252 through a suitable bore in the casing and into a recess 258 therein is a stem 259. In recess 258 the stem 259 is provided with a collar 260 against which bears one end of a spring 26I. The opposite end of spring 26I bears against a plunger 262 which is slidably mounted in recess 258 directly over the bias piston rod 256. In the empty position of the fulcrum roller 64 and in all positions therebetween and the position which said roller will assume for a substantially half loaded car, the plunger 262 will en-. gage the top of the bias piston rod 256 at the right hand side of the notch 251 but in all other positions of the fulcrum roller 64 the notch 251, will be disposed under the plunger 262 to permit movement of said plunger into said notch. With the plunger 262 engaging the bias piston rod 256 outside of the notch 251 the spring 26I will be compressed to a degree which will maintain valve 252 seated against pressure of fluid from the load reservoir 1 acting in chamber 253. However, when the rod 256 is' positioned to permit the plunger 262 to drop into notch 251 the spring 26I will expand to a degree where it will exert substantially no pressure on the rod 259'and there-- by on the valve 252.

The timing chamber 224 is open to the brake Operation-Jig. 3

In operation, let it be assumed that the fulcrum roller 64 is adjusted to its full load position permitting movement of the plunger 262 into the notch 251, and let it further be assumed that the equipment is being initially charged with fluid under pressure. With the brake 'controlling valve device I in the'position assumed during charging of the equipment, the pipe '35 will be open -to atmosphere through the brake cylinder pipe II; pipe 21, connected to the compensating pressure chamber 24 in the brake cylinder device 6, will be open to atmosphere past the open release Valve 53 of the load compensating device 8; the auxiliary reservoir 3 will be charged with fluid under pressure; and pipe 62 and the connected load reservoir 1 charged with fiuid under pressure, as well as pipe I53 connected to the brake pipe 2, in the same manner as hereinbefore described. Since the timing chamber 224- and chamber 223 are open through choke 263 and passages 264 to pipe I53 connected to the brake pipe, said chambers will become charged to the same pressure as in the brake pipe. With these chambers charged with fluid at brake pipe pressure, spring 229 will hold the diaphragms 226 and H9, and thereby the slide valve 236 in the position in which they are will beaugust 21 244" and thus to the auxiliary reservoir 3, whereby said chambers will become chargedwithfiui'd at the pressure in the auxiliaryreservoir; Also in this position of the slide valve 23!! the cavity 240 therein establishes communication between passages 234 and 235.

With the plunger 262 inthe notch 25'! pressure of fluid from the load reservoir 1 acting in chamher 253 will unseat thecheck valve 252- against spring 255' and flow to chamber 23'! and thence through choke 238 and passage 236 to the seat of slide valve 230. With the slide valve 230 in the'position in which it is shown in the drawing the end of passage 236 is lapped. Fluid under pressure will therefore continue to flow past'the check valve 252 to chamber 23'! until the pressure of-iluid in said chamber plus that of spring 255 acting on check valve 252 slightly overbalances the opposing pressure of fluid in chamber 253 acting on said' check valve whereupon the spring 255 will close said check valve. The check valve 252 and spring 255 therefore act in the capacity of a reducing valve for limiting the pressure of fluid in chamber 231 to a certain degree less than in the load reservoir, for example, to substantially the same pressure as obtained in the compensating pressure chamber 24 of the brake cylinder device 6 by operation of the delay valve device I13 shown in Fig. 1' of the drawing when the fulcrum roller 54 is in its full load position.

Upon'an emergency reduction in pressure in the brake pipe '2 for effecting an emergency application of brakes, fluid under pressure will flow to the usual pressure chamber 18 in the brake cylinder device 6 in the same manner as before described, At the same time as the brake pipe pressure reduces, the pressure of fluidin timing chamber 224 and diaphragm chamber 223 will reduce to the brake pipe through. choke 263, passage 2'64 and pipe I53, the flow capacity of this choke being so related to the voluine'of said time ing and diaphragm chambers as to permit a suflicient reduction in pressure to occur therein to enable auxiliary'..reservoir pressure acting in chamber 22! to deflect th diaphragm H9 and thereby move the stem 221-, slide valve 230' and the diaphragm 220 to their right hand position at. substantially the time the pressure of fluid in the usual brake cylinder pressure chamber [8 is increased to the chosen degree (25 pounds) at which the delay valve device I13, shown in Fig. 1 in the drawing, operates against spring I96 on a fully loaded car.

With the slide valve 230 in its right hand position cavity 240 therein establishes communication between passages 236 and. 235 whereupon fluid under pressure. will flow from the load reservoir 1 past the valve252 and thencethrough choke 238 and saidpassages to pipe 21 leading. to the compensating pressure chamber 24 in the brake cylinder device; The flow capacity of choke 2 38 is such as to permit the pressure of fluid in the compensating pressure chamber 24 of the brake cylinder device to increase generally in proportion to the increase in pressure in the usual pressure chamber 18 by operation of the AB valve l1, and spring 255 will act to seat the valve and thereby limit thev maximum pressure obtained in the brake cylinder compensating chamber to :achosen' degree less than in the usual pressure chamber corresponding substantially to the maximum pressure. of fluid obtained in the compensating. pressure chamber 24' by operation or the delay valve device. I113 inxa structure shown in Fig} 1'; whenthe fulcrum rolleili therf i in itsiull'loadposition. Y "Tnthe right hand position of the slide valve 233 communication between the timing chamber 222 andthe auxiliary reservoir 3- is'closed' and said chamber is connected through passage 231, cavity 239 in said slicle valve;-and to atmosph re throu choke233 s'olthat' the pressure of fluid in said chamber and'in chamber 221 gradually reduces to atmosphere. After a certain period of time, suflicien-t for the "slack in the train to completely gather, and therefore correspondingsubstantially to th time or operation of the timing valvede vice H4 in the structure shown in Fig, l, the pressure of fluid in chamber 222 and 22l will becomesuificiently reduced for spring 229 tomcv'e the diaphragms 220- and H9 and thereby the slide valve 230 backytc the position in which it is shown in the drawing, thereby intercepting the communication-between passages- 236 and 233 and connecting passage 235 to'234 whereby'the brake cylinder compensating chamber 2l-is reconnected to the release valve chamber 49 of the load compensating device 8; The release valve '53" in the loadcompensating device 8 being: opened with the fulcrum roller 64' in full load position, fluid under'pressure in the brake cylinder compensating, chamber 24 will then ventedto atmosphere whereby the pressure of fluid in the usual pressure chamber I8 or the brake cylinder device ll will be rendered fully efiective to provide the maximum degree of brakingforce on the car as required when fully loaded.

As fluid under pressure issupplied to the usual brake cylinder pressure chamber [8 in the brake cylinder device 6 and through pip 35- and passage 34 to the" pilot diaphragm chamber 33 in the load compensating device 8 in applying the brakes as above described, fluid also flows from passage 34 to diaphragm chamber 249, and when suflicient pressure is obtained in the latter chain-=- ber to overcome the opposing force of spring25l the diaphragm 248 will deflect against saidspring taclose t he valve 243 for thereby closing conimunication between the auxiliary reservoir and the valve chamber 239, The pressure of spring 25 i on the diaphragm 248 may be suchasto permit closing of the valve 243 immediately'fol lowing initiation of the application of brakes and the purpose of closing said valve is to prevent recharging of the chambers 222 and MI whenthe parts of the control valve device 2! return to the position in which they are shown on the drawing, from their right-hand position. Otherwise, recharging of chambers 222 and 22! from the auxiliary reservoir would cause the diaphragms. 2+9 and 22B and the slide valve 230 to be moved back to their right-hand positions, for resupplying fluid under pressure to the brake cylinder compensating chamber 24, when not desired. In other words, the closing of valve 243- insures that the diaphragms 222 and 22l and the slide valve 230' WilI remain in the position in which they are shown in the drawing after having been in their right-hand position.

The control valve device 2l8 will operate for. any degree of load onthe car between full-load. and substantially half-load in the samemanner as above described, except for less than full load the pressure of fluid in the brake cylinder compensating chamber 24 will not be reduced to atmospheric pressure when the timing slide valve 230 returns from its right-handposition" .to its left-hand position to connect said chamber to the release valvechamber 43 of the loadcompensating device. For less than full load the pressure in the brake cylindencompensating chamber will be .merely regulated according to the adjusted position of the fulcrum roller 64, and hence in accordance with the partial loaded condition of the car, as will be clear from the description of the structure shown in Fig. 1. I

I For less than a substantially half-load onthe car, however, the bias piston 11 will be so positioned as to move the plunger 262 into the notch 251, forincreasing the pressure of spring 255 against the. valve 252 to a degree suflicient to hold I said valve seated against load reservoir pressure in chamber 253. In effecting an emergency application of brakes under this condition the diaphragms 2I9 and 228 and the vslide valve 238 will move to their right-hand position and subsequently to their left-hand position the same asabove described, but will have no control over supply. of fluid to the brake cylinder compensating chamber 24 since the valve 252 is held seated, but fluid at the pressure corresponding to the adjusted position of the fulcrum ruler 64 will be supplied to said chamber by Way of the supply valve 60 in the load compensating device 8, thence through passage 38, past the check valve 24I and through passage 21, whereby the pressure of fluid in said chamber will be adjusted according to the loaded condition of the car.

. Whenthe car is less than fully loaded, but

more than half-loaded, the pressure of fluid supplied by the load compensating device 8 to passage 38 and thence to the underside of check valve 241 will be less than supplied past the valve 252 to passage 236 and thence to passage 35 and to the top of said check valve, so that the latter pressure will act to hold said check valve seated and prevent interference in the control of the pressure of fluid in the brake cylinder compensating chamber 24 by operation of the load compensating device 8. v a

In effecting a service application of brakes, brake pipe pressure remaining elfective in diaphragm. chamber 223 and timing chamber224 in diaphragm v228 plus the pressure of spring 229, will maintainthe parts of the control valve device 2I8 inthe position in which they are shown inthe drawing against reduced or reducing auxiliary reservoir-pressure in chamber 22I and 222 so that control. of the pressure of fluid in the brake cylinder compensating chamber 24 remains under control of the load compensating, device 8, the same as inthe Cook et a1. copending application hereinbefore referred to.

I DescripiionFig. 4

I According to this embodiment ofthe invention I associate with the load compensating device 8' a control valve device 265 comprising a valve 266 contained in a chamber 261 which is connectecl by pipe 21 to the brake cylinder compensating chamber 24. The valve 266 is connected by a stem 268 to'a sleeve 269 slidably mounted in a" bore in the casing; A bore through the valve 266 and stem 268 connects chamber 261 to a larger bore 210 in the sleeve 269 in which larger bore is slidably mounted the fluted stem of a valve 2' contained in a chamber 212 and arranged to seat on the end of said sleeve for closing communication between said chamber and chamber 261. Encircling the valve stem 268 isan annular chamber 213, the valve 266 being adapted to control communication between said chamber and chamber 261. Chamber-213 is connected through a choke-214 to a chamber 215 conspring corresponding in function and operation to the valve 252 and spring 255 in the structure shown in Fig. 3 of the drawing. A spring 219 in chamber 261 acts on thevalve 266 for urging it to its seated position.

The control valve device 26I furtherjcomprises a flexible diaphragm 288 clamped around its periphery in the casing and having at one side a chamber 28I open through a. passage 282 to; a pipe 283, said passage being also open through a choke 284 and a passage 285 to a timing cham ber 286. A diaphragm follower 261 engages the opposite side of the diaphragm 288 and has a stem 288 extending through a chamber 289 at said opposite side of the diaphragm and through a bore in a partition wall 298 into chamber 212.,

The stem 288 has a head 29I and hooked over this head is a finger 292 projecting from the valve 21I whereby movement of the stem 288 in a direction away from said valve will unseat said valve from sleeve 269. A spring 293 contained in chamber 289 acts against follower 281 for urging same and the diaphragm 288 to the position shown on the drawing in which the valve 21I is opened by said stem and the valve 266 is closed The pipe 283 connected to diaphragm chamber 28I leads to. the cut-out valve portion I39 of'the load compensating device 8. The slide valve I55 in the cut-out valve portion I39 is provided with a cavity 294 which in the cut-out position of said slide valve, as shown on the drawing, connects pipe 283 to the atmospheric port I551. The slide valve also is provided with a passage 295 which, in the cut-in or left-hand position of'the cut-out slide valve I55 is adapted to connect pipe 283 to the load reservoir pipe 62. I V

In operation, let it be assumed that the equipment is fully charged with fluid under pressure under which condition the main pressure chamber I8 of the brake cylinder device will be open to atmosphere and the parts of the cut-out valve' device I39 will be in their cut-outpos'ition, in which they are shown' on the drawing. In the cut-out position, the diaphragm chamber 28I'in the control valve device 265 will be open to atmosphere, as well as timing chamber 286 and spring chamber 289, through pipe'283, the slide valve cavity 295 and atmospheric passage 294. As a result, spring 293 will be urging the diaphragm 288 to the position in' which'it is shown on the drawing for thereby actuating the stem 288 for unseating the valve 21I from the end of atmosphere past the open release valve 53 in.

said device. The load reservoir 1, being charged with fluid under pressure, fluid will be supplied therefrom to passage 211 and past theucheck:

valve 215 tochamber: 2H3" encirclingthe. valve stemx 268,, the: pressure: or fluid inv saidchamberpipe 2 vented to. atmosphere}. for: effecting an emergency reductionin brake "pipe; pressure.

Upon an emergency reduction in pressure inqthebrake pipe 2 the the: pressure of, fluid in the cut-out valve chamber 449 will: promptly reduce to the degreev at IVhiQhLSDI'ing M4? is: unable to:

actuate the diaphragm MEI; andthe slide valve 1:55 to its cut-in position. In vthis-posit'ion, the

cavity 295 in the slide valve establishes com.

munication between the: load reservoir pipe 82? and pipe 2&32 whereupon fluid underpressure from said reservoir promptly equalizes-into diaphragm chamber 2- 8 of the controlvalve device- Efii and;

also flows at a restricted rate through choke 284: into the timingchamber 2.85 andspring chambBlZ 289 for gradually charging said. chambers with-"fluid under pressure; pressure oi fluid thus obtained in chamber 2*81 promptly deflects diaphragm 280 against spring 3293 for seating the valve 2' against the sleeve 2 59 and for then actuating said sleeve to unseat the valve 2'66. The closing of valve 211 closes;- communication between the load compensating device 8 and pipe 2'1 leading to the brake cylinder compensah ing chamber 24, whil'ethe opening of valve 266. connects said chamber by way of the latter pipe to chamber 213- encircling' the valve stem 268. Fluid underpressure from the load reservoir pipe 62 will then flow through passage- 21% pastthe check valve 216 and through choke 2M to chamher 213 and thence past the valve 266 to chamher 261 from whence it will flowthrough pipe 21 to the load compensating pressure chamber 24' in the brake cylinder deviee'fi. The choke Z-"M so restricts this flow of fluid under'pressure to the brake cylinder compensatin-gchamber 24" as to provide an increase'in pressure in said chamber generally parallel to" that provided in the usual pressure chamber ill by operation of the AB valve device I, while the spring are: acting on the check valve 216 'isadapted to coact With-the pressure of liuidin chamber 215' to-sea-t said check valve, when the pressure of fluid in the brake cylinder compensating chamber 2'4 is: increased to a degreesuibstantiallythe same. as permitted by spring 152 in the structure shown in Fig. 3,01 by spring 596 in the delay valve device H3 in the structure shown in Fig. 1c.

While fluid under pressure is being supplied to the compensating chamber 24 the brake cylinder device, as just described, fluid under pressure from the load reservoir is also flowingfrom passage 282 through ch'oke 284- into the timing chamber 286 as Well as into chamber 289 below the diaphragm 280. The flow capacity of choke- 284 is so related to'the combined volumes of chamber 286 and 289 that after a certain lapseof time from initiating the supply oi? fluid under pressure to pipe 283 a sufiicient pressurewill be obtained in chamber 289, which acting with spring 293, will overcome the'opposing pressure of fluid in diaphragm chamber 281 and return the diaphragm 283 to the position in which it is shown on the drawing. This time elapse is such as to insure a complete gathering of slack in the train, and therefore corresponds"substantially to the time which idiaphragms 2:09 and 1220 and the slide valve 230 in the structure show-ninl lig. 3 remain in their right-hand position before they are 26 returned to their:leit-handiposl on, or he time. elapse between initiating an mergency r duce t-ionv inbrake; nine pressur and: r tu n of t e. parts of: the timing valve devi e I 41. on the structureshownimFig-i 1 eithedrawing tpztheirright-hand position.

When the; diaphra m 280 ofthe; contr l valve device 255 is returned: to its upper position-lit unseatsh'evalve; 2?! I: andtpermitsvclosina of-' alve 25a by spring 219; The closin of? valve 266- o oses c mmunication between he load r serv ir andthebrake cylinder compensating chamber; 24, by way of checkvalve; 2, 11: and connects said chamber past the openvalve 2H. to; chamber- 2.1:,

and thence by way of passage 38 to the release valve chamberg 4a in the load: compensating; device 8t. If,the-oasisnllly loadeditherel ase valve 53 in the load compensating device 8 willibeopen; so that fluidunder pressure will beventech from the brake cylindercompensating chamber 2,4 to; atmosphere to thereby render the pressure of fluid in the usual pressure chamber l8 efiective: to, actuate piston l9 to provide the highdegree of braking-required: fonth'e fully loaded car. How-V ever for any degree of load less than full-load down to and includingthe empty car, the connecting of the load-compensatingprfissure chama ber 24f in the brake cylinder device to the release-v valve chamber 48 in; the load compensating device 58 will render said: compensating; deviceiefiec tive to promptly adjust the pressure of fluid in said compensating chamber according to the loaded condition of the. car, for thereby limiting the efiect-iveness of: the brake cylinder piston N: to a degree proportional totheweight ofthe car, whether empty or loaded, and as limited by the p a i tod p sition of the fulcrum: roller- 54. i

In this embodiment the control valve-device 2615' will operate, as. just described; regardless of the weight of thecar; that. is, it will operate the same if the car is empty as if fully loaded; in contrast with the structure shown in- Figs. L and. 3 of the drawingsv where. corresponding control? oi pressure of: fluid the compensating cham.-, ber of the brake cylinder device is limitedto from. a, full-load position tolasubslialltially half-loaded posit-ionof the fulcrumyroller 6A.

The cut-out valve; device; i535. remains in its. cut-outposition in. whichit is. shown in the drawn ing upon a service; reduction in brake Pipe pressure; whereby-theparts of the control valve device 285 will remain in theposition in which they are also shown, so that when a service ap-v plication of brakes is effective said control valve device will have no control over such an appli-i cation, and said control will be entirely by the load compensating device 8-, the same as the Cooket al. application above reierredto.

Summary i It will now beseen that I have provided means adapted toibe associated with the load compensating brake equipment disclosed in the'aforementioned Cook et al. contending application for so regulating an emergency application of brakes on a railway car as to insure gathering of slack in a train of such cars without development of damaging shock upon efiecting an emergency application ofbrakes. The regulating means consists of structure or initially limiting the braking force obtained .on the car of a train to t e properdegree for gentle gathering of slack and operates automatically after a period of time required for substantial complete gathering of train slack'to transfer the-control of braking force to the load compensating device which then effects adjustment of such force to the loaded condition of the car, whereby prompt stopping of the train will then occur. The control means may be of a type such as illustrated in Figs. 1 and 3 of the drawing and therefore operative only when the load carried by the car exceeds a certain degree, such as half-load, or if desired, it may be of the nature of the structure shown in Fig. 4 which operates the same for all degrees of car load as well as When the car is empty, although the need for regulation is greatest when the car is fully loaded and actually may not be required for an empty or relatively lightly loaded car.

- Having now describedmy invention, what I claim as new and desireto secure by Letters Patent, is:

1. A fluid pressure brake equipment fora vehicle comprising in combination, a brake pipe, brake cylinder means having two pressure chambers and operative to provide a braking force on said vehicle in accordance with the pressure of fluid in said chambers, brake controlling means operative upon a reduction in pressure in said brake pipe to supply fluid under pressure to one of said chambers, and control means comprising valve means operative upon a reduction in brake pipe pressure to supply fluid under pressure to the other of said chambers, and means operative a chosen interval of time after said operation of said control means, to cut off the supply of fluid under pressure to-said other chamber and to open a fluid pressure release communication therefrom.

2. A fluid pressure brake equipment for a vehicle comprising in combination, a brake pipe, brake cylinder means having two pressure chambers and operative to provide a braking force on said vehiclein accordance with the pressure of' fluid in said chambers-brake controlling means operative upon a reduction in pressure in said brake pipe to supply fluid under pressure to one of said chambers, control means comprising valve means for controlling supply and release of fluid under pressure to and from the other of said chambers, actuating means operative only upon an emergency reduction in pressure in said brake pipe to effect operation of said valve means to supply fluid under pressure to said other chamber, means operative, a chosen interval of time after said operation of said actuating means to eflect operation of said valve means, to cut off the supply of fluid under pressure to said other chamber and to open a fluid pressure release communication from said other chamber, and means for proportioning the rate of supply of fluid to and the pressure of fluid obtained in said other chamber to the rate of supply to and the pressure of fluid obtained in said one chamber.

3. A fluid pressure brake equipment for a vehicle comprising in combination, a brake pipe, brake cylinder means having two pressure chambers and operative to provide a braking force on said vehicle in accordance with the pressure of fluid in said chambers, brake controlling means operative upon a reduction in pressure in said brake pipe to supply fluid under pressure to one of said chambers, control means comprising valve means for controlling supply and release of fluid under pressure to and from the other of said chambers, a spring, actuating means adapted to be subjected in a third chamber to pressure of fluid in said one chamber acting in opposition to pressure of fluid insaid other chamber plus pressure offluid in said brake pipe and of said spring and operative by fluid under pressure in said third chamber upon an increase therein to overcome the opposing pressures, to supply fluid under pressure to said other chamber at a rate and to a pressure proportional to the rate of supply and degree of pressure in said one chamber, means operative by pressure of fluid in said other chamber upon release of fluid under pressure from said third chamber to establish a fluid pressure release communication from said other chamber, and timing means normally establishing communication between said one and third chambers and operative a chosen interval of time after said operation of said actuating means to close said communication and to release fluid under pressure from said third chamber.

4. A fluid pressure brake equipment for a vehicle comprising in combination, a brake pipe, brake cylinder means having two pressure chambers and operative to provide a braking force on said vehicle in accordance with the pressure of fluid in said chambers, brake controlling means operative upon a reduction in pressure in said brake pipe to supply fluid under pressure to one of said chambers, control means comprising valve means for controlling supply and release of fluid under pressure to and from said other chamber, spring means, two connected movable abutments for controlling said valve means, one of said abutments being subject on one side to pressure of fluid in a third chamber acting in opposition to pressure of fluid in said other chamber on the opposite side, plus brake pipe pressure and the pressure of said spring means acting on the other abutment and being operative by pressure of fluid in said third chamber upon a preponderance thereof over the opposing pressures, upon an emergency reduction in brake pipe pressure, to actuate said valve means to supply fluid to said second chamber at a pressure proportional to the pressure in said one chamber and operative by said opposing pressures upon release of fluid under pressure from said third chamber to open a fluid pressure release communication to said other chamber, timing means comprising a valve, means operative upon an increase in pressure of fluid in a timing chamber to actuate said valve to connect said third chamber to said first chamber, means operative upon a chosen reduction in pressure of fluid in said timing chamber to actuate said valve to disconnect said third chamber from said onechamber and to release fluid under pressure from said third chamber, a check valve in a fluid pressure supply communication from said brake pipe to said timing chamber, means operative by said control means upon an emergency reduction in pressure in said brake pipe to open said check valve for releasing fluid under pressure from said timing chamber to said brake pipe, and choke means in the fluid pressure release communication from said timing chamber for providing said chosen reduction in pressure of fluid in said timing chamher a chosen interval of time after opening said check valve.

5. A fluid pressure brake equipment for a vehicle comprising in combination, a brake pipe, brake cylinder means having two pressure chambers and operative to provide a braking force on said vehicle in accordance with the pressure of fluid in said chambers, brake controlling means operative upon a reduction in pressure in said brake pipe to supply fluid under pressure to one of said brake cylinder pressure chambers, valve means arenas? 29 for supplying fluidunder pressure to the other brake cylinder pressure chamber and for establishing a fluid pressure release communication from said other brake cylinder pressurev chamber,spring.,means, movable abutment means sub j-ect toypressure of said spring means and of fluid in a first timing vchamber open to said brake pipe and to opposing, pressure -offluidin a second timing; chamber normally charged with fluidqunder pressure, and operative by pressure of' fluid in said second timing chamber upon a reduction in pressure of fluid inv said first timing chamber in response to an emergency reduction in brake pipe pressure, to eflect operation of said valve means to supply fluid under pressuretosaid other brake cylinderpressure chamber, said valve means being operative upon operation. to supply fluid under pressure to said other brake cylinder pressure chamber to also release fluid under pressure from said second timing chamber, and means for restricting said release of fiuid under pressure from said second timing chamber to render said-spring means eflectire to actuate said valve means to out ofl the supply of fluid under pressure to said other brake cylinder pressure chamberl and-to release the fluid pressure therefrom a chosen interval of time after initiating said emergency reduction in brake pipe pressure.

6.. A fluid pressure brake equipment for a vehicle comprising in combination, a brake pipe, brake cylinder means having two pressurechamhers, and operative to provide-a braking force on said. vehicle in accordance with the pressure of fluid :in said chambers, brake controlling means operative upon a reduction in pressure in said brake pipe to supply fluid under pressure to one of said brake cylinder pressure chambers, valve means for supplying fluid under pressureto said other brake cylinder pressure chamber and for establishing a fluid pressure release communication therefrom, means for proportioning the rate of'said supply of fluid under pressure to and the degree of pressure obtained in said other brake cylinder pressure chamber to the pressure of fluid in said one brake cylinderpressure chamber, spring means, movable abutment ineans subjectto pressure of said spring means and'of fluid in a first timin chamber open to said :brake pipe andto opposing pressure of fluid in a second timing chamber, and operative by pressure of fluid in said second timing chamber in response to a reduction in pressure of fluid in said first timing chamber upon an emergency reduction in brake pipe pressure toeffect operation of said valve means to supply fluid under pressure to said other brake-cylinder pressure chamber, choke means for restricting release of fluid under pressure from said first timing chamber upon an emergency reduction in .brake pipe pressure to delay for a chosen interval of time after initiating said emergency reduction, the operation of saidvalve means to supply fluid under pressure to said other brake cylinder pressure chamher, said valve means being operative during operation to supply fluid under pressure to said other brake cylinder pressure chamber to also release fluid under pressure from-said second timing chamber, andmeans for restricting the release of fluid under pressure from said second timing chamber torender said spring means effective to actuate said valve means to cut ofi the supply of fluid under pressuretosaid other brake cylinder pressure chamber and to release the fluid pressure therefrom' a chosen interval-of 30 time after initiating said emergency reduction in brake pipe pressure.

'l. A fluid pressure brake equipment tor a -vehicle comprising-in combination, a brake pipe, brake cylinder means having, two pressure chambers. and operative to provide a braking force on said vehicle in accordance With the pressure of fluid in said chambers, 'brake controlling means operative upona reduction in pressure-in said brake pipe to supply fluid under pressure to one of said brake cylinder pressure chambers, a scurce of fluid under pressure, valve means for supplying fluid under pressure to said other brake cylinder pressure chamber and for establishing a .fluid pressure release communication therefrom, spring means, movable abutment means subject to pressure ,of said spring means and of fluid in a first timing chamber open'to said brake pipe acting inopposition to pressure of fluid in a second timing chamber, said movable abutment means being operative by pressure of fluid in said first timing chamber to actuate said valve means to establish a fluid pressure supply communication Jtrcm said source of fluid under pressure to said, second timing chamber 'for changing said second timing chamber, and being op cr ative by pressure'of fluid in saidsecond timing chamber inresponse to a reduction in pressure of fluid in said first timing chamber, "upon; an emergency reduction of brake pipe pressure, .-to effect operation of said valve means to supply fluid under pressure to said other brakecylinder pressure "chamber, said valve means being operative upon operation to supply fluid underpressureto-said otherbrake cylinder pressure charm berxto .also reiease fluid under pressure from said second timing chamber, means for restricting the release 'of fluidunder pressure from said second timing chamber-to render said spring means eflective to actuate said valve means to cutoff the supply of fluid under pressure to said other chamber 'andto release the fluid pressure therefrom a chosen interval of time after initiating said emergency reduction in brake pipe pressure, and means operative by fluid under pressure supplied to said one chamber for closing communication between said source of fluid under pressure and said second timing chamber.

13, A fluidw'pressure brake equipment for a vehicle comprising in combination, a brake pipe, brakecylinder meansthaving two pressure chambers and operative to provide a braking force on said vehicle in accordance with the pressure of fluid in said chambers, brake controlling means operative upon a reduction in pressure in said brake pipe to supply fluid under pressure to one of said 'brake cylinder pressure chambers, valve means for supplying fluid pressure to and for establishing a fluid pressure release communication from the other brakecylinder pressure-chamher, control means controlled by brake pipe pressure operative upon a reduction in brake pipe pressure atoa :chosen low :degree to effect operation :OT-'S9Jid valve means to supply fluid under pressure to said other brake cylinder pressure chamber :at :a rate and to a pressure proportional to the pressure in said one brake cylinder pressure chamber, and means for effecting-operation ofsaid valve means to cut off the supplyof fluid to and to-open a fluid pressure release communication from said other brake cylinder pressure chamber a chosen interval of time after said operation of said control means. i

19. A-fluid ressure brake equipment for ave hicle comprising in combination, a brake pipe,

brake cylinder means having two pressure chambers and operative to provide a braking force on said vehicle in accordance with the pressure of fluid in said chambers, brake controlling means operative upon a reduction in pressure in said brake pipe to supply fluid under pressure to one of said brake cylinder pressure chambers, valve means operable by a differential in opposing fluid pressures to supply fluid under pressure to said other brake cylinder pressure chamber, means operative upon a certain reduction in the degree of said differential to effect operation of said valve means to establish a fluid pressure release communication from said other brake cylinder pressure chamber, control means operative upon an emergency reduction in pressure in said brake pipe to establish said diflerential in pressures for actuating said valve means, and means for effecting said certain reduction in said differential a chosen interval of time after said operation of said control means.

10. A fluid pressure brake equipment for a vehicle comprising in combination, a brake pipe, a brake cylinder device comprising a piston having on one side a certain area which is subject to pressure of fluid in one chamber and havin a reduced area on the opposite side subject to pressure of fluid in a second chamber, and operative to provide a braking force onthe vehicle in accordance with the differential in forces developed on opposite sides of said piston by pressure of fluid in said chambers, brake controlling means operative upon a reduction in pressure in said brake pipe to supply fluid under pressure to said one chamber, control means comprising valve means operative upon a reduction in pressure in said brake pipe to supply fluid under pressure to said second chamber, means operative a chosen interval of time after said operation of saidcontrol means, to cut off the supply of fluid under pressure to said second chamber and to open a fluid pressure release communication therefrom, and means for limiting the rate of supply of fluid under pressure to and the degree of pressure obtained in said second chamber by operation of said valve means.

' 11. A fluid pressure brake equipment for a vehicle comprising in combination, a brak pipe, a brake cylinder device comprising a piston having on one side a certain area which is subject to pressure of fluid in one chamber and having a, reduced area on the opposite side subject to pressure of fluid in a second chamber, and operative to provide a braking force on the vehicle in accordance with the differential in forces developed on opposite sides of said piston by pressure of fluid in said chambers, an AB valve operative upon an emergency reduction in pressure in said brake pipe to supply fluid under pressure to said one chamber, control means operative upon said supply of fluid under pressure to said one chamber to supply fluid under pressure to said second chamber, means for proportioning the rate of supply and the degree of pressure obtained in said second chamber substantially to the rate of supply and pressure in said one chamber, and means operative a chosen interval of time after said operation of said control means to cut off the supply of fluid to said other chamber and to open a fluid pressure release communication therefrom.

12. A fluid pressure brake equipment for a vehicle comprising, in combination, a brake pipe, brake cylinder means having two pressure chambers and operative to produce a braking force on said vehicle in accordance with the pressures of fluid in said chambers, brake controlling means responsive to a reduction iii brake pipe'pressure to supply fluid under pressure to one of said pressure chambers, control means operative upon a, reduction in brake pipe pressure to supply fluid to the other of said chambers at a pressure less than in said one chamber, adjustable means for limiting the pressure of fluid in said other chamber in accordance with the adjustment thereof, means for adjusting said adjustable means in accordance with the weight of said vehicle, and means'for rendering said control means inefiective and said adjustable means effective to control pressure of fluid in said other chamber.

13. In a fluid pressure brake for a vehicle, in combination, a brake pipe, brake cylinder means having two pressure chambers and operative to provide braking force on said vehicle in accord-- ance with the pressure of fluid'in said chambers, brake controlling means operative upon a reduc tion in pressure in said brake pipe to supply fluid under pressure to one of said chambers, adjustable load compensatin means operable by fluid under pressure in said one chamber to supply fluid to a passage at a pressure proportional to the adjustment thereof and to the pressure in said one chamber, means for adjusting said compen satin means according to the weight'of the vehicle, valve means controlling communication between said passage and other chamber and operable upon a reduction in brake pipe pressure to close said communication and to supply fluid under pressure to said other chamber, and timing means for effecting operation of said valve means a chosen intervalof time after operation thereof to supply fluid under pressure to said otherchamber, to cut off such supply and to establish said communication.

14. In a fluid pressure brake for a vehicle, in combination, a brake pipe, brake cylinder'means having two pressure chambers and operative to provide braking force on said vehicle in accordance with the pressure of fluid in said chambers, brake controlling means operative upon a reduction in pressure in said brake pipe to supply fluid under pressure to one of said chambers, adjustable load compensating means operable upon supply of fluid under pressure to said one chamber to supply fluid to a passage at a pressure proportional to the adjustment thereof and to the pressure in said one chamber, means for adjusting said compensating means according to the Weight of the vehicle, valve means controlling communication between said passage and said other chamber and operative upon an emergency reduction in brake pipe pressure to close said communication and to open a second communication for supplying fluid under pressure to said other chamber, means for limiting the supply of fluid under pressure to said other chamber through said second communication to a rate substantially proportional to the supply of fluid under pressure to said one chamber and for cutting off the supply of fluid under pressure to said other chamber through said second communication at a chosen pressure less than in said one chamber, and timing means'for effectin operation of said valve means, a chosen interval of time after operation thereof to open said second communication, to close said second communication and to establish the first mentioned communication.

15. In a fluid pressure brake for a vehicle, in combination, a brake pipe, brake cylinder means having two pressure chambers and operative to provide braking force on said vehicle in accordance with the pressure of fluid in said chambers, brake controlling means operative upon a reduction in pressure in said brake pipe to supply fluid under pressure to one of said chambers, adjustable load compensating means, means for adjusting said compensating means according to the weight of the vehicle, said compensating means being operable upon supply of fluid under pressure to one chamber to vary pressure of fluid in a passage from atmospheric pressure for a maximum loaded weight of the vehicle inversely in proportion to the vehicle weight to a chosen maximum pressure for the empty weight of the vehicle, valve means controlling communication between said passage and other chamber and operable upon an emergency reduction in brake pipe pressure to close said communication and to supply fluid under pressure to said other chamber, means for limiting the supply of fluid under pressure to said other chamber by said valve means to a rate generally proportional to the rate of supply of fluid under pressure to said one chamber and to a chosen degree less than in said one chamber, and timing means for effecting operation of said valve means, a chosen interval of time after operation thereof to supply fluid under pressure to said other chamber, to cut off such supply and establish said communication.

16. In a fluid pressure brake equipment for a vehicle having a load carrying sprung part and an unsprung part, a brake pipe, a brake cylinder device comprising a casing, a piston therein dividing said easing into a main pressure chamber at one side of said piston and a compensating chamber at the opposite side and operative to provide braking force on said Vehicle controlled by the difference in forces created by pressure of fluid in said chambers, brake controlling means operative upon a reduction in brake pipe pressure to supply fluid under pressure to said main chamber, a load compensating device comprising an adjustable member and operable upon supply of fluid under pressure to said main chamber to supply fluid to said compensating chamber at a pressure in accordance with the adjustment thereof and the pressure of fluid in said main chamber, adjusting means operable in accordance with the position of said sprung part with respect to said unsprung part to correspondingly adjust said load compensating device, valve means controlling communication between said load compensating device and compensating pressure chamber, means operative upon an emergency reduction in pressure in said brake pipe to effect operation of said valve means to close said communication and to supply fluid under pressure to said compensating pressure chamber, means for limiting the rate of supply of fluid under pressure to said compensating chamber and the maximum pressure obtained therein by said valve means to a degree generally proportional to the pressure provided in said one chamber, and means for eifecting operation of said valve means, a chosen interval of time after operation thereof to initiate supply of fluid under pressure to said compensating chamber, to terminate such supply and connect said compensating chamber to said load compensating device.

17. A fluid pressure brake equipment for a load carrying vehicle comprising in combination, a brake pipe, brake cylinder means having two pressure chambers and operative to provide braking force on said vehicle in accordance with the pressure of fluid in said chambers, brake controlling means operable upon a reduction in brake pipe pressure to supply fluid under pressure to one of said chambers, a load reservoir, adjustable load compensating means, mechanism for adjusting said compensating means in accordance with the weight of said vehicle, said compensating means being operative upon supply of fluid under pressure in said one chamber to supply fluid from said load reservoir to a, passage at a pressure proportional to the adjustment thereof and to the pressure of fluid in said one chamber, valve means operable upon an emergency reduction in brake pipe pressure to close communication between said other chamber and said compensating means and to supply fluid from said load reservoir to said other chamber, means for limiting the supply of fluid under pressure to said other chamber by operation of said valve means to a rate and degree proportional to that in said one chamber, and timing means operable, a chosen interval of time after operation of said valve means to supply fluid under pressure from said load reservoir to said other chamber, to cut off such supply and to open said communication.

18. A fluid pressure brake equipment for a load carrying vehicle comprising in combination, a brake pipe, brake cylinder means having two pressure chambers and operative to provide braking force on said vehicle in accordance with the pressure of fluid in said chambers, brake controlling means operable upon a reduction in brake pipe pressure to supply fluid under pressure to one of said chambers, a load reservoir, load compensating means comprising an adjustable element, mechanism for positioning said element in accordance with the weight of the vehicle between full-load and empty, said compensating means being operative upon supply of fluid under pressure to said one chamber to supply fluid from said load reservoir to a, passage at a pressure proportional to the adjustment of said compensating means and to the pressure of fluid in said one chamber, valve means operable upon an emergency reduction in brake pipe pressure to close communication between said passage and said other chamber and to supply fluid under pressure from said load reservoir to said other chamber, means for limiting the rate of said supply of fluid under pressure to said other chamber to a degree generally proportional to the rate of supply of fluid under pressure to said one chamber, means including a valve for limiting the pressure of fluid obtained in said one chamber by operation of said valve means to a degree less than in said one chamber, timing means operable, a chosen interval of time after operation of said valve means to initiate supply of fluid under pressure from said load reservoir to said other chamber, to cut off such supply and to connect said other chamber to said compensating means, means operable by said member when adjusted to correspond to less than a chosen degree of load on the vehicle to effect operation of said valve to prevent supply of fluid under pressure from said load reservoir to said other chamber by operation of said valve means and to render said valve operative for a, greater degree of load on the vehicle, and means including a check valve providing a one-way flow communication between said compensating means and said other chamber by-passing said valve means.

ELLIS E. HEWITT. 

